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EP3979750A1 - Procédé d'accès aléatoire et dispositif associé - Google Patents

Procédé d'accès aléatoire et dispositif associé Download PDF

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Publication number
EP3979750A1
EP3979750A1 EP19939992.4A EP19939992A EP3979750A1 EP 3979750 A1 EP3979750 A1 EP 3979750A1 EP 19939992 A EP19939992 A EP 19939992A EP 3979750 A1 EP3979750 A1 EP 3979750A1
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EP
European Patent Office
Prior art keywords
bwps
ssb
bwp
selection factor
network device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP19939992.4A
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German (de)
English (en)
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EP3979750A4 (fr
EP3979750B1 (fr
Inventor
Ning Yang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guangdong Oppo Mobile Telecommunications Corp Ltd
Original Assignee
Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Priority to EP23184867.2A priority Critical patent/EP4243552A3/fr
Publication of EP3979750A1 publication Critical patent/EP3979750A1/fr
Publication of EP3979750A4 publication Critical patent/EP3979750A4/fr
Application granted granted Critical
Publication of EP3979750B1 publication Critical patent/EP3979750B1/fr
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H04W74/0841—Random access procedures, e.g. with 4-step access with collision treatment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/001—Synchronization between nodes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/02—Selection of wireless resources by user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0866—Non-scheduled access, e.g. ALOHA using a dedicated channel for access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/004—Transmission of channel access control information in the uplink, i.e. towards network

Definitions

  • the present disclosure relates to the field of communication technology, and more particular, to a random access method and a related apparatus.
  • each user equipment (UE) in an idle state or an inactive state may access a network through an initial bandwidth part (BWP) indicated in system information block (SIB1) broadcast, which is acceptable for light load scenarios.
  • BWP initial bandwidth part
  • SIB1 system information block
  • a random access method and a related apparatus are provided in implementations of the present disclosure to improve a success rate of random access.
  • a random access method is provided in implementations of the present disclosure.
  • the method is applicable to a user equipment (UE) and includes the following.
  • a first bandwidth part (BWP) is selected from multiple BWPs, where the multiple BWPs are configured by a network device.
  • a first physical random access channel (PRACH) resource corresponding to a first synchronization signal block (SSB) is determined.
  • a random access preamble is transmitted on the first BWP based on the first PRACH resource.
  • PRACH physical random access channel
  • SSB synchronization signal block
  • a random access apparatus in implementations of the present disclosure.
  • the apparatus is applicable to a UE and includes a selecting unit, a determining unit, and an information transmitting unit.
  • the selecting unit is configured to select a first BWP from multiple BWPs, where the multiple BWPs are configured by a network device.
  • the determining unit is configured to determine a first PRACH resource corresponding to a first SSB.
  • the information transmitting unit is configured to transmit a random access preamble on the first BWP based on the first PRACH resource.
  • a UE in implementations of the present disclosure.
  • the UE includes a processor, a memory, and a communication interface.
  • the memory is configured to store one or more programs.
  • the one or more programs are configured to be executed by the processor and includes instructions configured to perform the method in the first aspect of implementations of the present disclosure.
  • a computer-readable storage medium in implementations of the present disclosure.
  • the computer-readable storage medium is configured to store computer programs for electronic data interchange.
  • the computer programs are operable with a computer to perform the method in the first aspect of implementations of the present disclosure.
  • a computer program product in implementations of the present disclosure.
  • the computer program product includes computer program instructions which are operable with a computer to perform the method in the first aspect of implementations of the present disclosure.
  • the computer program product may be a software installation package.
  • a chip in implementations of the present disclosure.
  • the chip includes computer program instructions.
  • the computer program instructions are operable with a computer to perform the method in the first aspect of implementations of the present disclosure.
  • a computer program is provided in implementations of the present disclosure.
  • the computer program is operable with a computer to perform the method in the first aspect of implementations of the present disclosure.
  • the network device configures multiple BWPs for the UE.
  • the UE selects one BWP from the multiple BWPs, then determines a PRACH resource corresponding to an SSB, and finally transmits a random access preamble on the selected BWP based on the determined PRACH resource.
  • PRACH resource capacity limitation is alleviated, a random access capacity is increased, thereby improving a success rate of random access.
  • FIG. 1 is a schematic diagram of a communication system architecture provided in an implementation of the present disclosure.
  • the communication system includes a network device and a user equipment (UE). As illustrated in FIG. 1 , the network device can communicate with the UE.
  • the communication system may be a global system for mobile communication (GSM), a code division multiple access (CDMA) system, a wideband code division multiple access (WCDMA) system, a worldwide interoperability for microwave access (WiMAX) system, a long term evolution (LTE) system, a 5th generation (5G) communication system, such as a new radio (NR) system, a communication system that integrates multiple communication technologies, such as a communication system that integrates LTE technologies and NR technologies, or a future evolved communication system.
  • GSM global system for mobile communication
  • CDMA code division multiple access
  • WCDMA wideband code division multiple access
  • WiMAX worldwide interoperability for microwave access
  • LTE long term evolution
  • 5G 5th generation
  • NR new radio
  • the UE in the present disclosure is a device with a wireless communication function.
  • the UE may be deployed on land, for example, deployed indoors or outdoors, and may be handheld, wearable, or vehicle-mounted.
  • the UE may also be deployed on water, for example, on a ship, etc.
  • the UE may also be deployed in the air, for example, on an airplane, an air balloon, a satellite, etc.
  • the UE may be a mobile phone, a pad, a computer with a wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal in industrial control, a wireless terminal in self driving, a wireless terminal in remote medical, a wireless terminal in smart grid, a wireless terminal in smart home, etc.
  • VR virtual reality
  • AR augmented reality
  • the UE may also be a handheld device, a vehicle-mounted device, a wearable device, or a computer device with a wireless communication function, or another processing device connected to a wireless modem.
  • the UE may have different names, such as, terminal device, access terminal, user unit, user station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent, or user device, cellular phone, cordless phone, session initiation protocol (SIP) phone, wireless local loop (WLL) station, personal digital assistant (PDA), terminal device in a 5G network or a future evolved network, etc.
  • SIP session initiation protocol
  • WLL wireless local loop
  • PDA personal digital assistant
  • the network device in the present disclosure is a device deployed in a wireless access network to provide a wireless communication function.
  • the network device may be a radio access network (RAN) device on access network side in a cellular network.
  • the so-called RAN device is a device configured to connect the UE to a wireless network, and includes but is not limited to: an evolved node B (eNB), a radio network controller (RNC), a node B (NB), a base station controller (BSC), a base transceiver station (BTS), a home base station, for example, a home evolved node B or a home node B (HNB), a base band unit (BBU), or a mobility management entity (MME).
  • eNB evolved node B
  • RNC radio network controller
  • NB node B
  • BSC base station controller
  • BTS base transceiver station
  • HNB home evolved node B
  • BBU base band unit
  • MME mobility management entity
  • the network device may also be a node device in a wireless local area network (WLAN), such as an access controller (AC), a gateway, or a wireless fidelity (Wi-Fi) access point (AP).
  • WLAN wireless local area network
  • the network device may also be a transmission node or a transmission reception point (TRP or TP) in an NR system.
  • 5G application scenarios mainly include an enhanced Mobile Broadband (eMBB) scenario, an ultra-reliable low-latency communication (URLLC) scenario, a massive machine type of communication (mMTC) scenario, etc.
  • eMBB enhanced Mobile Broadband
  • URLLC ultra-reliable low-latency communication
  • mMTC massive machine type of communication
  • a new radio resource control (RRC) state i.e., an RRC inactive state is defined.
  • the RRC inactive state is different from an RRC idle state and an RRC connected state.
  • RRC idle state there is no RRC connection, mobility is based on UE cell selection/reselection, paging is initiated by a core network (CN), a paging area is configured by the CN, and there is no UE access stratum (AS) context in the network device.
  • CN core network
  • AS UE access stratum
  • the RRC connection exists, the UE AS context exists in the network device and the UE, the network device is aware that a position of the UE is represented in a specific cell level, the mobility is controlled by the network device, and unicast data can be transmitted between the UE and the network device.
  • the mobility is based on UE cell selection/reselection, there is a connection between the CN and NR, the UE AS context exists in a network device, the paging is triggered by an RAN, an RAN-based paging area is managed by the RAN, and the network device is aware that the position of the UE is based on a paging area level of the RAN.
  • a supported maximum channel bandwidth i.e., a wideband carrier
  • a radio frequency (RF) bandwidth of the UE may be adjusted according to an actual throughput of the UE to optimize the power consumption of the UE, this is the motivation for introducing BWP.
  • a UE in the connected state can only have one active downlink (DL) BWP and one active uplink (UL) BWP at most at a moment.
  • the network device can configure up to four UL BWPs and up to four DL BWPs for the UE in the connected state.
  • FDD frequency division duplex
  • the network device may configure four UL BWPs with indexes 0, 1, 2, 3 and four DL BWPs with indexes 0, 1, 2, 3 for a UE in the connected state, where a current active UL BWP may have index 0, and a current active DL BWP may have index 1.
  • DCI downlink control information
  • a UE in the idle state or in the inactive state obtains a master information block (MIB) and an SIB 1 of a resident cell through a cell defining synchronization signal block (CD-SSB).
  • the SIB1 indicates related configuration information of an initial BWP used for initial access of the UE.
  • the related configuration information of the initial BWP contains related configuration information of an initial UL BWP and related configuration information of an initial DL BWP.
  • the network device configures a random access resource to the UE for initial access. There is a correspondence between random access resources and SSBs.
  • the network device configures a reference signal received power (RSRP) threshold, such as an SSB RSRP threshold, to control the UE to select a random access resource.
  • RSRP reference signal received power
  • the UE selects an SSB with a RSRP measurement value satisfying the RSRP threshold, then selects a corresponding random access resource according to the correspondence between random access resources and SSBs to transmit a random access preamble, and receives a random access response message transmitted by the network device on the SSB selected.
  • RSRP reference signal received power
  • FIG. 2 is a schematic flowchart of a random access method provided in an implementation of the present disclosure. The method includes the following.
  • Step 201 a UE selects a first BWP from multiple BWPs, where the multiple BWPs are configured by a network device.
  • the multiple BWPs are used for random access, and may or may not include an initial BWP, which is not limited herein.
  • the multiple BWPs are configured by the network device through an SIB1. Specifically, the network device broadcasts information of each BWP among the multiple BWPs through the SIB1.
  • the information of each BWP includes at least one of: a DL BWP configuration and a UL BWP configuration.
  • the DL BWP configuration includes a physical downlink control channel (PDCCH) configuration and a physical downlink shared channel (PDSCH) configuration.
  • the UL BWP configuration includes a physical uplink control channel (PUCCH) configuration, a physical uplink shared channel (PUSCH) configuration, and a random access channel (RACH) configuration.
  • the multiple BWPs may also be configured by the network device through other SIBs, or configured by the network device through a radio resource control (RRC) dedicated signaling, such as an RRC release message, etc., which is not limited herein.
  • RRC radio resource control
  • Step 202 the UE determines a first physical random access channel (PRACH) resource corresponding to a first SSB.
  • PRACH physical random access channel
  • the UE determines the first PRACH resource corresponding to the first SSB based on a correspondence between SSBs and PRACH resources.
  • the correspondence between SSBs and PRACH resources is configured by the network device.
  • the correspondence between SSBs and PRACH resources may be configured by the network device through an SIB1, configured by the network device through other SIBs, or configured by the network device through an RRC dedicated signaling, such as an RRC release message, etc., which is not limited herein.
  • the multiple BWPs each include the first SSB, or the first BWP selected includes the first SSB.
  • Step 203 the UE transmits a random access preamble on the first BWP based on the first PRACH resource.
  • the network device configures multiple BWPs for the UE.
  • the UE selects one BWP from the multiple BWPs, then determines a PRACH resource corresponding to an SSB, and finally transmits a random access preamble on the selected BWP based on the determined PRACH resource.
  • PRACH resource capacity limitation is alleviated, a random access capacity is increased, thereby improving a success rate of random access.
  • FIG. 3 is a schematic flowchart of another random access method provided in an implementation of the present disclosure. The method includes the following.
  • Step 301 a UE selects a first BWP from multiple BWPs based on first selection factor information, where the first selection factor information is configured by a network device.
  • the first selection factor information may be configured by the network device through an SIB1, configured by the network device through other SIBs, or configured by the network device through an RRC dedicated signaling, such as an RRC release message, etc., which is not limited herein.
  • the first selection factor information indicates that the multiple BWPs each have a same selection factor.
  • the first selection factor information indicates that selection factors of the four BWPs are the same. If a sum of the selection factors of the four BWPs is equal to 1, then the four BWPs each have a selection factor of 0.25.
  • the first selection factor information indicates selection factors of the multiple BWPs.
  • the multiple BWPs include an initial BWP
  • the first selection factor information indicates a selection factor of the initial BWP and indicates that BWPs among the multiple BWPs other than the initial BWP each have a same selection factor
  • the first selection factor information indicates that a selection factor of the initial BWP is a, and that selection factors of other BWPs are the same. If a sum of selection factors of the four BWPs is equal to 1, the other three BWPs each have a selection factor of (1- a )/3.
  • the UE selects the first BWP from the multiple BWPs based on the first selection factor information as follows.
  • the UE determines a selection factor of each BWP among the multiple BWPs based on the first selection factor information.
  • the UE randomly selects the first BWP from the multiple BWPs based on the determined selection factor of each BWP.
  • the UE randomly selects the first BWP from the multiple BWPs based on the determined selection factor of each BWP as follows.
  • the UE generates multiple first numerical intervals based on the determined selection factor of each BWP, and generates a first random number, where the generated multiple first numerical intervals are in one-to-one correspondence with the multiple BWPs.
  • the UE selects the first BWP from the multiple BWPs based on the first random number and the multiple first numerical intervals.
  • the generated first numerical intervals include 0 ⁇ 0.25, 0.25 ⁇ 0.5, 0.5 ⁇ 0.75, and 0.75 ⁇ 1, a first numerical interval 0-0.25 corresponds to BWP0, a first numerical interval 0.25-0.5 corresponds to BWP1, a first numerical interval 0.5-0.75 corresponds to BWP2, and a first numerical interval 0.75-1 corresponds to BWP3.
  • the first BWP is BWP0
  • the generated first random number falls within 0.25 ⁇ 0.5
  • the first BWP is BWP1
  • the generated first random number falls within 0.5 ⁇ 0.75
  • the first BWP is BWP2
  • the generated first random number falls within 0.75 ⁇ 1, the first BWP is BWP3.
  • the first BWP is BWP0
  • the first BWP is BWP1
  • the first BWP is BWP2
  • the first BWP is BWP3
  • the first BWP is BWP3
  • the UE selects the first BWP from the multiple BWPs based on the first selection factor information as follows.
  • the UE determines a selection factor of each BWP among the multiple BWPs based on the first selection factor information.
  • the UE selects the first BWP from the multiple BWPs based on the determined selection factor of each BWP, where a selection factor of the first BWP is greater than or equal to a selection factor of every BWP other than the first BWP.
  • Step 302 the UE determines a first PRACH resource corresponding to a first SSB, where the first SSB is determined based on a second measurement result of a CD-SSB, the multiple BWPs each include the CD-SSB, and a RSRP of the first SSB is greater than or equal to a second RSRP threshold.
  • the multiple BWPs each include the first SSB.
  • the second RSRP threshold may be, for example, the above-mentioned SSB RSRP threshold or have other values.
  • the UE is aware of a position of the CD-SSB, and performs SSB measurement on the CD-SSB to obtain the second measurement result.
  • the second measurement result includes RSRPs of multiple SSBs, and the multiple SSBs include the first SSB.
  • Step 303 the UE transmits a random access preamble on the first BWP based on the first PRACH resource.
  • the network device configures multiple BWPs for the UE.
  • the UE selects one BWP from the multiple BWPs based on selection factor information indicated by the network device, determines an SSB based on a measurement result of a CD-SSB, then determines a PRACH resource corresponding to the SSB, and finally transmits a random access preamble on the selected BWP based on the determined PRACH resource.
  • PRACH resource capacity limitation is alleviated, a random access capacity is increased, thereby improving a success rate of random access.
  • FIG. 4 is a schematic flowchart of another random access method provided in an implementation of the present disclosure. The method includes the following.
  • Step 401 a UE selects a first BWP from multiple BWPs based on first selection factor information, where the first selection factor information is configured by a network device.
  • Step 402 the UE determines a first PRACH resource corresponding to a first SSB, where the first SSB is determined based on a third measurement result, the third measurement result is obtained by the UE through SSB measurement based on SSB measurement timing configuration (SMTC) information of the first BWP, the SMTC information of the first BWP is configured by the network device, and a RSRP of the first SSB is greater than or equal to a third RSRP threshold.
  • SMTC SSB measurement timing configuration
  • the first BWP selected includes the first SSB.
  • the third RSRP threshold may be, for example, the above-mentioned SSB RSRP threshold or have other values.
  • the network device may also configure SMTC information of BWPs among the multiple BWP other than the first BWP.
  • the SMTC information may be configured by the network device through an SIB 1 (specifically, the SMTC information may be or not be configured in BWP information, which is not limited herein), configured by the network device through other SIBs, or configured by the network device through an RRC dedicated signaling, such as an RRC release message, etc., which is not limited herein.
  • the SMTC information includes at least one of: an SSB measurement period, offset, and measurement duration.
  • the third measurement result obtained by the UE through SSB measurement based on the SMTC information of the first BWP includes RSRPs of multiple SSBs, and the multiple SSBs include the first SSB.
  • Step 403 the UE transmits a random access preamble on the first BWP based on the first PRACH resource.
  • the network device configures multiple BWPs for the UE.
  • the UE selects one BWP from the multiple BWPs based on the selection factor information indicated by the network device, performs SSB measurement based on SMTC information of the selected BWP to obtain a measurement result, then determines an SSB based on the measurement result, determines a PRACH resource corresponding to the SSB, and finally transmits a random access preamble on the selected BWP based on the determined PRACH resource.
  • PRACH resource capacity limitation is alleviated, a random access capacity is increased, thereby improving a success rate of random access.
  • there is no need for every configured BWP to include the CD-SSB thereby enabling the network device to allocate BWP positions more flexibly.
  • FIG. 5 is a schematic flowchart of another random access method provided in an implementation of the present disclosure. The method includes the following.
  • Step 501 a UE selects a first BWP corresponding to a service type of the UE from multiple BWPs based on a correspondence between service types and BWPs, where the correspondence between service types and BWPs is configured by a network device.
  • the correspondence between service types and BWPs may be configured by the network device through an SIB1, configured by the network device through other SIBs, or configured by the network device through an RRC dedicated signaling, such as an RRC release message, etc., which is not limited herein.
  • the multiple BWPs include BWP0, BWP1, BWP2, and BWP3, the correspondence between service types and BWPs includes, for example, industrial sensor network devices corresponding to BWP1, video surveillance devices corresponding to BWP2 or BWP0, and wearable devices corresponding to BWP3.
  • the multiple BWPs include BWP0, BWP1, BWP2, and BWP3, the correspondence between service types and BWPs includes, for example, industrial sensor network devices corresponding to BWP1, video surveillance devices corresponding to BWP2, wearable devices corresponding to BWP3, and others corresponding to BWP0.
  • the method further includes the following.
  • the UE selects a first BWP from the multiple first BWPs based on second selection factor information, where the second selection factor information is configured by the network device.
  • the second selection factor information may be configured by the network device through an SIB1, configured by the network device through other SIBs, or configured by the network device through an RRC dedicated signaling, such as an RRC release message, etc., which is not limited herein.
  • the second selection factor information indicates that the multiple BWPs each have a same selection factor.
  • the second selection factor information indicates selection factors of the multiple BWPs.
  • the multiple BWPs include an initial BWP
  • the second selection factor information indicates a selection factor of the initial BWP and indicates that BWPs among the multiple BWPs other than the initial BWP each have a same selection factor
  • the UE selects the first BWP from the multiple first BWPs based on the second selection factor information as follows.
  • the UE determines a selection factor of each first BWP among the multiple first BWPs based on the second selection factor information.
  • the UE randomly selects the first BWP from the multiple first BWPs based on the determined selection factor of each first BWP.
  • the UE randomly selects the first BWP from the multiple first BWPs based on the determined selection factor of each first BWP as follows.
  • the UE generates multiple second numerical intervals based on the determined selection factor of each first BWP, and generates a second random number, where the generated multiple second numerical intervals are in one-to-one correspondence with the multiple first BWPs.
  • the UE selects the first BWP from the multiple first BWPs based on the second random number and the multiple second numerical intervals.
  • the second selection factor information indicates that the multiple BWPs each have a same selection factor, if a sum of selection factors of the four BWPs is equal to 1, then BWP0 and BWP1 each have a selection factor of 0.25, and the generated second numerical intervals include 0 ⁇ 0.25+(0.25+0.25)/2 and 0.25+(0.25+ 0.25)/2 ⁇ 1.
  • a second numerical interval 0-0.5 corresponds to BWP0
  • a second numerical interval 0.5-1 corresponds to BWP1. If the generated second random number, such as a random number from 0 to 1, falls within 0 ⁇ 0.5, the first BWP selected is BWP0, and if the generated second random number falls within 0.5 ⁇ 1, the first BWP selected is BWP1.
  • the multiple BWPs include BWP0, BWP1, BWP2, and BWP3
  • the second selection factor information indicates that a selection factor of BWP0 is a
  • a selection factor of BWP1 is b
  • a selection factor of BWP2 is c
  • a selection factor of BWP3 is d
  • the generated second numerical intervals include 0 ⁇ a +(1 -a - b )/2 and a +(1- a-b )/2 ⁇ 1 .
  • a second numerical interval 0 ⁇ a +(1- a-b )/2 corresponds to BWP0, and a second numerical interval a +( 1-a-b )/2 ⁇ 1 corresponds to BWP1. If the generated second random number, such as a random number from 0 to 1, falls within 0 ⁇ a +(1 -a-b )/2, the first BWP selected is BWP0, and if the generated second random number falls within a +(1 -a-b )/2 ⁇ 1, the first BWP selected is BWP1.
  • the UE selects the first BWP from the multiple first BWPs based on the second selection factor information as follows.
  • the UE determines a selection factor of each first BWP among the multiple first BWPs based on the second selection factor information.
  • the UE selects the first BWP from the multiple first BWPs based on the determined selection factor of each first BWP, where a selection factor of the first BWP is greater than or equal to a selection factor of every BWP other than the first BWP.
  • the multiple BWPs include BWP0, BWP1, BWP2, and BWP3
  • a selection factor of BWP0 is a
  • a selection factor of BWP1 is b
  • a selection factor of BWP2 is c
  • a selection factor of BWP3 is d, if a>b, then the first BWP selected is BWP0.
  • Step 502 the UE determines a first PRACH resource corresponding to a first SSB.
  • the first SSB is determined based on a second measurement result of a CD-SSB
  • the multiple BWPs each include the CD-SSB
  • a RSRP of the first SSB is greater than or equal to a second RSRP threshold.
  • the first SSB is determined based on a third measurement result
  • the third measurement result is obtained by the UE through SSB measurement based on SMTC information of the first BWP selected
  • the SMTC information of the first BWP selected is configured by the network device
  • a RSRP of the first SSB is greater than or equal to a third RSRP threshold.
  • Step 503 the UE transmits a random access preamble on the first BWP based on the first PRACH resource.
  • the network device configures multiple BWPs for the UE.
  • the UE selects one BWP from the multiple BWPs based on a correspondence between service types and BWPs indicated by the network device, then determines a PRACH resource corresponding to a SSB, and finally transmits a random access preamble on the selected BWP based on the determined PRACH resource.
  • PRACH resource capacity limitation is alleviated, a random access capacity is increased, thereby improving a success rate of random access.
  • BWPs are allocated based on service types, thereby realizing on-demand resource allocation and load balancing.
  • FIG. 6 is a schematic flowchart of another random access method provided in an implementation of the present disclosure. The method includes the following.
  • Step 601 a UE selects a first BWP corresponding to an index of a second SSB from multiple BWPs based on a correspondence between SSB indexes and BWPs, where the correspondence between SSB indexes and BWPs is configured by the network device, the second SSB is determined based on a first measurement result of a CD-SSB, and a RSRP of the second SSB is greater than or equal to a first RSRP threshold.
  • the first RSRP threshold may be, for example, the above-mentioned SSB RSRP threshold or have other values.
  • the UE is aware of a position of the CD-SSB, and performs SSB measurement on the CD-SSB to obtain the first measurement result.
  • the first measurement result includes RSRPs of multiple SSBs, and the multiple SSBs include the second SSB.
  • the second SSB is an SSB with a maximum RSRP value among the multiple SSBs.
  • the correspondence between SSB indexes and BWPs may be configured by the network device through an SIB1, configured by the network device through other SIBs, or configured by the network device through an RRC dedicated signaling, such as an RRC release message, etc., which is not limited herein.
  • the correspondence between SSB indexes and BWPs includes, for example, indexes 1 and 2 corresponding to BWP0, indexes 3 and 4 corresponding to BWP1, indexes 5 and 6 corresponding to BWP2, and indexes 7 and 8 corresponding to BWP3.
  • the multiple BWPs include BWP0, BWP1, BWP2, and BWP3
  • the correspondence between SSB indexes and BWPs include, for example, indexes 1, 2, and 3 corresponding to BWP0, indexes 4 and 5 corresponding to BWP1, indexes 6, 7, and 8 corresponding to BWP2, and other corresponding to BWP3.
  • the method further includes the following.
  • the UE selects a first BWP from the multiple first BWPs based on third selection factor information, where the third selection factor information is configured by the network device.
  • the third selection factor information may be configured by the network device through an SIB1, configured by the network device through other SIBs, or configured by the network device through an RRC dedicated signaling, such as an RRC release message, etc., which is not limited herein.
  • the third selection factor information indicates that the multiple BWPs each have a same selection factor.
  • the third selection factor information indicates selection factors of the multiple BWPs.
  • the multiple BWPs include an initial BWP
  • the third selection factor information indicates a selection factor of the initial BWP and indicates that BWPs among the multiple BWPs other than the initial BWP each have a same selection factor.
  • the UE selects the first BWP from the multiple first BWPs based on the third selection factor information as follows.
  • the UE determines a selection factor of each first BWP among the multiple first BWPs based on the third selection factor information.
  • the UE randomly selects the first BWP from the multiple first BWPs based on the determined selection factor of each first BWP.
  • the UE randomly selects the first BWP from the multiple first BWPs based on the determined selection factor of each first BWP as follows.
  • the UE generates multiple third numerical intervals based on the determined selection factor of each first BWP, and generates a third random number, where the generated multiple third numerical intervals are in one-to-one correspondence with the multiple first BWPs.
  • the UE selects the first BWP from the multiple first BWPs based on the third random number and the multiple third numerical intervals.
  • the third selection factor information indicates that the multiple BWPs each have a same selection factor, if a sum of selection factors of the four BWPs is equal to 1, then BWP0 and BWP 1 each have a selection factor of 0.25, and the generated third numerical intervals include 0 ⁇ 0.25+(0.25+0.25)/2 and 0.25+(0.25 +0.25)/2 ⁇ 1 .
  • a third numerical interval 0-0.5 corresponds to BWP0
  • a third numerical interval 0.5-1 corresponds to BWP1. If the generated third random number, such as a random number from 0 to 1, falls within 0 ⁇ 0.5, the first BWP selected is BWP0, and if the generated third random number falls within 0.5 ⁇ 1, the first BWP selected is BWP1.
  • the multiple BWPs include BWP0, BWP1, BWP2, and BWP3
  • the third selection factor information indicates that a selection factor of BWP0 is a
  • a selection factor of BWP1 is b
  • a selection factor of BWP2 is c
  • a selection factor of BWP3 is d
  • the generated third numerical intervals include 0 ⁇ a +(1 -a-b )/2 and a +(1 -a-b )/2 ⁇ 1.
  • a third numerical interval 0 ⁇ a +(1- a-b )/2 corresponds to BWP0, and a third numerical interval a +1 -a-b )/2 ⁇ 1 corresponds to BWP1. If the generated third random number, such as a random number from 0 to 1, falls within 0 ⁇ a +(1 -a-b )/2, the first BWP selected is BWP0, and if the third random number generated falls within a+(1- a-b )/2 ⁇ 1, the first BWP selected is BWP1.
  • the UE selects the first BWP from the multiple first BWPs based on the third selection factor information as follows.
  • the UE determines a selection factor of each first BWP among the multiple first BWPs based on the third selection factor information.
  • the UE selects the first BWP from the multiple first BWPs based on the determined selection factor of each first BWP, where a selection factor of the first BWP is greater than or equal to a selection factor of every BWP other than the first BWP.
  • the multiple BWPs include BWP0, BWP1, BWP2, and BWP3
  • a selection factor of BWP0 is a
  • a selection factor of BWP1 is b
  • a selection factor of BWP2 is c
  • a selection factor of BWP3 is d, if a>b, then the first BWP selected is BWP0.
  • Step 602 the UE determines a first PRACH resource corresponding to a first SSB.
  • the first SSB and the second SSB are a same SSB.
  • the first SSB is determined based on a second measurement result of a CD-SSB
  • the multiple BWPs each include the CD-SSB
  • a RSRP of the first SSB is greater than or equal to a second RSRP threshold.
  • the first SSB is determined based on a third measurement result
  • the third measurement result is obtained by the UE through SSB measurement based on SMTC information of the first BWP selected
  • the SMTC information of the first BWP selected is configured by the network device
  • a RSRP of the first SSB is greater than or equal to a third RSRP threshold.
  • Step 603 the UE transmits a random access preamble on the first BWP based on the first PRACH resource.
  • the network device configures multiple BWPs for the UE.
  • the UE selects one BWP from the multiple BWPs based on a correspondence between SSB indexes and BWPs indicated by the network device, then determines a PRACH resource corresponding to a SSB, and finally transmits a random access preamble on the selected BWP based on the determined PRACH resource.
  • PRACH resource capacity limitation is alleviated, a random access capacity is increased, thereby improving a success rate of random access.
  • BWPs are allocated based on SSB indexes, thereby realizing on-demand resource allocation and load balancing.
  • FIG. 7 is a UE provided in an implementation of the present disclosure.
  • the UE includes one or more processors, one or more memories configured to store one or more programs, and one or more communication interfaces.
  • the one or more programs are configured to be executed by the one or more processor and includes instructions configured to perform the following.
  • a first BWP is selected from multiple BWPs, where the multiple BWPs are configured by a network device.
  • a first PRACH resource corresponding to a first SSB is determined.
  • a random access preamble is transmitted on the first BWP based on the first PRACH resource.
  • the program in terms of selecting the first BWP from the multiple BWPs, includes instructions specifically configured to perform the following.
  • the first BWP is selected from the multiple BWPs based on first selection factor information, where the first selection factor information is configured by the network device.
  • the first selection factor information indicates that the multiple BWPs each have a same selection factor.
  • the first selection factor information indicates selection factors of the multiple BWPs.
  • the multiple BWPs include an initial BWP
  • the first selection factor information indicates a selection factor of the initial BWP and indicates that BWP among the multiple BWPs other than the initial BWP each have a same selection factor
  • the program in terms of selecting the first BWP from the multiple BWPs, includes instructions specifically configured to perform the following.
  • the first BWP corresponding to a service type of the UE is selected from the multiple BWPs based on a correspondence between service types and BWPs, where the correspondence between service types and BWPs is configured by the network device.
  • the program further includes instructions configured to perform the following.
  • a first BWP is selected from the multiple first BWPs based on second selection factor information, where the second selection factor information is configured by the network device.
  • the program in terms of selecting the first BWP from the multiple BWPs, includes instructions specifically configured to perform the following.
  • the first BWP corresponding to an index of a second SSB is selected from the multiple BWPs based on a correspondence between SSB indexes and BWPs, where the correspondence between SSB indexes and BWPs is configured by the network device, the second SSB is determined based on a first measurement result of a CD-SSB, and a RSRP of the second SSB is greater than or equal to a first RSRP threshold.
  • the first SSB and the second SSB are a same SSB.
  • the program further includes instructions configured to perform the following.
  • a first BWP is selected from the multiple first BWPs based on third selection factor information, where the third selection factor information is configured by the network device.
  • the first SSB is determined based on a second measurement result of a CD-SSB
  • the multiple BWPs each include the CD-SSB
  • a RSRP of the first SSB is greater than or equal to a second RSRP threshold.
  • the first SSB is determined based on a third measurement result
  • the second measurement result is obtained by the UE through SSB measurement based on SMTC information of the first BWP
  • the SMTC information of the first BWP is configured by the network device
  • a RSRP of the first SSB is greater than or equal to a third RSRP threshold.
  • FIG. 8 is a random access apparatus provided in an implementation of the present disclosure.
  • the apparatus is applicable to a UE and includes a selecting unit 801, a determining unit 802, and an information transmitting unit 803.
  • the selecting unit 801 is configured to select a first BWP from multiple BWPs, where the multiple BWPs are configured by a network device.
  • the determining unit 802 is configured to determine a first PRACH resource corresponding to a first SSB.
  • the information transmitting unit 803 is configured to transmit a random access preamble on the first BWP based on the first PRACH resource.
  • the selecting unit 801 in terms of selecting the first BWP from the multiple BWPs, is specifically configured to: select the first BWP from the multiple BWPs based on first selection factor information, where the first selection factor information is configured by the network device.
  • the first selection factor information indicates that the multiple BWPs each have a same selection factor.
  • the first selection factor information indicates selection factors of the multiple BWPs.
  • the multiple BWPs include an initial BWP
  • the first selection factor information indicates a selection factor of the initial BWP and indicates that BWPs among the multiple BWPs other than the initial BWP each have a same selection factor
  • the selecting unit 801 is specifically configured to: select the first BWP corresponding to a service type of the UE from the multiple BWPs based on a correspondence between service types and BWPs, where the correspondence between service types and BWPs is configured by the network device.
  • the selecting unit 801 is further configured to: if the service type of the UE corresponds to multiple first BWPs, select a first BWP from the multiple first BWPs based on second selection factor information, where the second selection factor information is configured by the network device.
  • the selecting unit 801 is specifically configured to: select the first BWP corresponding to an index of a second SSB from the multiple BWPs based on a correspondence between SSB indexes and BWPs, where the correspondence between SSB indexes and BWPs is configured by the network device, the second SSB is determined based on a first measurement result of a CD-SSB, and a RSRP of the second SSB is greater than or equal to a first RSRP threshold.
  • the first SSB and the second SSB are a same SSB.
  • the selecting unit 801 is further configured to: if the index of the second SSB corresponds to multiple first BWPs, select a first BWP from the multiple first BWPs based on third selection factor information, where the third selection factor information is configured by the network device.
  • the first SSB is determined based on a second measurement result of a CD-SSB
  • the multiple BWPs each include the CD-SSB
  • a RSRP of the first SSB is greater than or equal to a second RSRP threshold.
  • the first SSB is determined based on a third measurement result
  • the third measurement result is obtained by the UE through SSB measurement based on SMTC information of the first BWP
  • the SMTC information of the first BWP is configured by the network device
  • a RSRP of the first SSB is greater than or equal to a third RSRP threshold.
  • the selecting unit 801 and the determining unit 802 may be implemented by a processor, and the information transmitting unit 803 may be implemented by a communication interface.
  • a computer storage medium is also provided in implementations of the present disclosure.
  • the computer storage medium is configured to store computer programs for electronic data interchange.
  • the computer programs are operable with a computer to perform any method in method implementations.
  • the computer includes a UE.
  • a computer program product is also provided in implementations of the present disclosure.
  • the computer program product includes computer program instructions which are operable with a computer to perform any method in method implementations.
  • the computer program product may be a software installation package.
  • the computer includes a UE.
  • a chip is also provided in implementations of the present disclosure.
  • the chip includes computer program instructions which are operable with a computer to perform any method in method implementations.
  • the computer includes a UE.
  • a computer program is also provided in implementations of the present disclosure.
  • the computer program is operable with a computer to perform any method in method implementations.
  • the computer includes a UE.
  • the apparatus disclosed in implementations provided herein may be implemented in other manners.
  • the device/apparatus implementations described above are merely illustrative; for instance, the division of the unit is only a logical function division and there can be other manners of division during actual implementations, for example, multiple units or components may be combined or may be integrated into another system, or some features may be ignored, omitted, or not performed.
  • coupling or communication connection between each illustrated or discussed component may be direct coupling or communication connection, or may be indirect coupling or communication among devices or units via some interfaces, and may be electrical connection, mechanical connection, or other forms of connection.
  • the units described as separate components may or may not be physically separated, the components illustrated as units may or may not be physical units, that is, they may be in the same place or may be distributed to multiple network elements. All or part of the units may be selected according to actual needs to achieve the purpose of the technical solutions of the implementations.
  • the functional units in various implementations of the present disclosure may be integrated into one processing unit, or each unit may be physically present, or two or more units may be integrated into one unit.
  • the above-mentioned integrated unit can be implemented in the form of hardware or a software function unit.
  • the integrated unit may be stored in a computer-readable memory when it is implemented in the form of a software functional unit and is sold or used as a separate product.
  • the technical solutions of the present disclosure essentially, or the part of the technical solutions that contributes to the related art, or all or part of the technical solutions, may be embodied in the form of a software product which is stored in a memory and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device and so on) to perform all or part of the steps described in the various implementations of the present disclosure.
  • the memory includes various medium capable of storing program codes, such as a universal serial bus (USB) flash disk, a read-only memory (ROM), a random-access memory (RAM), a removable hard disk, disk, compact disc (CD), or the like.
  • USB universal serial bus
  • ROM read-only memory
  • RAM random-access memory
  • CD compact disc
  • a program to instruct associated hardware may be stored in a computer-readable memory, which may include a flash memory, a read-only memory (ROM), a random-access memory (RAM), disk or compact disc (CD), and so on.
  • a computer-readable memory which may include a flash memory, a read-only memory (ROM), a random-access memory (RAM), disk or compact disc (CD), and so on.

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CN113678563B (zh) 2024-04-09
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US20220117005A1 (en) 2022-04-14
WO2021017016A1 (fr) 2021-02-04
EP3979750A4 (fr) 2022-07-13
US12120751B2 (en) 2024-10-15
EP3979750B1 (fr) 2023-09-27

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